Protector-block.



G. ANDERSON.

PROTECTOR BLOCK.

APPLICATION FILED APR. 8, 1911v Patented Aug. 15, 1911.

Inventor Attorneys UNITED srnrns PATENT orrion.

GUST ANDERSON; OF SPOKANE, WASHINGTON, ASSIGNOR ONE-HALF TO ALEXANDER LANDEN, 0F SPOKANE, WASHINGTUN.'

PROTECTOR-BLOCK.

Specification of Letters Patent.

Patented Au 15, 1911 Application filed April 8, 1911; Serial No. 619,798.

To-cll whom it may concern:

Be it known that I, Gus'r ANDERSON, a citizen of the United States, residing at Spokane, in the countyof Spokane and State of "Washington, have invented a new and useful Protector-Block, of which the following is a specification. v

It is the object'of the present invention to provide a block so constructed that the falls cannot by any possibility jump from the.

sheave, and become wedged between the sheave and the supporting structure n which the sheath is journaled for rotation.

Another object of the invention is to provide a means whereby the lateral friction of the sheave against the, supporting structure will be diminished. I

With the foregoinga' other objects in view which will appear as; the description proceeds, the invention resides in the comb;- nation and arrangement of parts and 1n the details of construction hereinafter described and claimed, it beingunderstood that changes in the precise embodiment of 1nvention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawings,-Figure 1 is a side elev.vation; Fig. 2 is a sectional top plan; and

Fig. 3 is a sectional side elevation.

The supporting structure may be of any form, Preferably, however, it consists of primary members 1, having inwardly extended ribs 2 in their central portions, and

secondary members 3, extended across the primarymembers 1 upon the outer faces of the primary members. In their central 'portions, the secondary members 3 are thickened, as denoted-by the numeral 4, these thickened portions 4 being notched, as shown at 5, to receive the angularly disposed primary members 1. At their point of crossing, the primary and secondary members are connected by a securing element 6, preferably a bolt, and upon this bolt is journaled for rotation, between the ribs 2 of the primary members 1, the sheave 7,

the sheave having the usual grooved tread to receive'the falls.

In the primary members 1, and in the secondary members 3, auxiliary pulleys 8 are journaled for rotation, adjacent the periphery of'the sheave 7. These auxiliary puL leys 8 are grooved, to define flanges 10, adapted to overlap the Side faces of the sheave 7. The axle portions 12 of the pulleys 8 are disposed in close relation to the periphery of the The auxiliary pulleys 8 are preferably journaled for rotation upon bolts 9, or other securing elements, extending through the primary members 1, and through the secondary members 3. The ends of the primary members 1, and the-ends of the secondary members 3, are united-by bolts or other securing'elements, denoted by the numeral 14. Certain of these bolts 14, preferably those which are located at the ends of the primary members I, carry rot-atably, be-

tween the primary members 1, collars .15, from which outstand hooks 16.

It will be seen that the-rope 17 may be extended about the sheave 7 in any desired direction, and the ends of the rope carried off at practically any angle. Owing to the fact that the periphery of the sheave 7 fits between the flanges 10 of the auxiliary pul-, leys 8, and owing to the fact that the axle portion 12 of each of the auxiliary pulleys 8, is located in close proximity to the periphery of the sheave 7, the rope 17 cannot jump from the sheave 7, and become lodged between the sheave and any portion of the supportingstructure; The pulleys 8, moreover, exercise another important function in the operation of the structure. It is to be sheave 7.

noted that owing to the fact that the periphery of the sheave 7 is engaged between the flanges 10 of the auxiliary pulleys 8, the

sheave 7 cannot come into contact with the ribs 2 or into contact laterally, with any other portion of the sheave-supporting structure- The sheave 7 is peripherally engaged by the flanges 10 of the auxiliary pulle s 8, and since these pulleys 8 are journaled for rotation, the pulleys receive, rotatably, any lateral thrust which may be exerted by the sheave 7, and thus the friction of the sheave is greatly reduced.

It will be seen, readily, that the hooks 16, :100

or either of them, may be engaged with an overhead support, with a stake driven into the ground, or with any other convenient and accessible form of support. The device is capable of a wide application, but it will be found useful, primarily, in logging operations.

Having thus described the invention, what is claimed is 1; In a device of the class described, a supsheave, the auxiliary pulleys having flanges porting structure; a sheavejournaled for rotation therein; and auxiliary pulleys journaled' for rotation "in the supporting structure, about the periphery of the sheave, the pulleys having flanges adapted to overlie both sides of the sheave.

2. In a device of the class described, a supporting structure; a sheave journaled for rotation therein; and auxiliary pulleys journaled for rotation in the supporting structure and disposed about the periphery of the extended inwardly upon both sides of the sheave, beyond the periphery of the sheave, and toward the axis of rotation of the sheave.

3. In a device of the class described, a supporting structure; a sheave journaled for rotation therein; and an auxiliary pulley journalgd folkrotation in the supporting structure, adjacent the periphery .of the sheave, the auxiliary pulley havin a groove, into which the periphery of the s eave proects. 1

4- In a device of the class described, intersecting primary and secondary members;

a retaining element uniting the primarv and secondary members at the1r pomt of intersection; a sheave journaled for rotation upon the retaining element; and auxiliary pulleys journaled for rotation inthe primary and secondary members, the auxiliary pulleys having grooves within which the periphery r pulleys journaled for rotation in the supporting structure, about the periphery of the sheave, the auxiliary pulle adapted to overlie the s1de faces of the sheave, to prevent the sheave from coming into contact with the supportin structure, laterally, and the auxiliary pul eys having axle portions, disposed in close relation to the periphery of the sheave, whereby the flexible member which is passedabout the sheave, will be prevented from jumping from the sheave. 5

In testimony thatI claim the foregoing as m own, I'have hereto a'fiixed my slgnature 1n the presence of two Witnesses.

GUST, ANDERsori.

' Witnesses:

A. LANDEN, J. A. SULLIVAN.

ys having flangesv 

